Pin tumbler lock



1952 v. s. D. BERNARDO 2,620,649

PIN TUMBLER LOCK Filed Feb. 1a. 1948 F/GJ A'I'TEI R N EYE Patented Dec.9, 1952 PIN TUMBLER LOCK Vicente Santo Domingo Bernardo, Binondo,Manila, Phillippine Islands Application February 18, 1948, Serial No.9,262

. V l This invention relates to looks of the pin] or tumblertypejwherein a key receiving cylinder actuates'the lock bolt and thecylinder is freeto turn only when divided pins have been actuated topredeterminedpositions by a key, and in particular theinventionrel-atesto a tumbler lock having in additionto the usual row ofpins or tumblers'a 7 second row parallel to the former row and staggeredin relation thereto and a safety pin positionedflopposite to the usualrow' of pins and adapted to register with a recess in the back of thekey.

The purpose of this invention is to provide a lock of the pin or tumblertype that is substantially impossible to pick open or actuate with apass key.

In the usual lock it is possible to manipulate the pins with a wire orrelatively small device so that the separating points are aligned withthe surface of the cylinder so that the cylinder may be turned toactuate or open the lock. With this thought in mind this inventioncontemplates a cylinder lock' wherein the key slot is arcuatelinstead ofstraight and in which two rows of pins are used and an additional pin isprovided in the opposite side. 7

' The object of this invention is to provide means for incorporating asecond row of pins in a cylinder lock and also a pin'for' engaging theback or other part of a key wherein it is substantially impossible topick the lock.

a cylinder lock having an arcuate key slot so that it is difiicult toopen the lock with a wire or the like.

A further object of the invention is to provide a cylinder lock of thepin type having a double row of pins and an oppositely positioned pin toengage the back of a key which is of a simple and economicalconstruction.

With these and other objects and advantages in view the inventionconsists of the new and novel combination, construction, and arrangementof parts as hereinafter more fully described, set forth in the claimappended hereto and disclosed in the accompanying drawings, forming parthereof, wherein:

Figure 1 is a view showing a side elevation of the lock.

Figure 2 is a view showing an end elevation of the lock looking towardthe rear thereof.

Figure 3 is also an elevation of the lock looking toward the frontthereof.

Figure 4 is a longitudinal section through the lock illustrating therelative positions of the parts, and taken on line 44 of Figure 2.

Another object of the invention is to provide- 1 Claim. (Cl. 7i)358) 2Figure 5 is a sectional plan through the housing or casing of the locktaken on the center thereof and looking downward. f y.

Figure 6 is a cross section through the cylinder showing the relativepositions of the key slot and pins. I

Figure 7 is a view showing a key adaptedto be usedin the lock, with partbroken away. j Referring now to the drawings wherein like referencecharacters denote corresponding parts the tumbler lock of this inventionincludes a cylinder l0 which is rotatably mounted in a, casing Il,:andwhich is provided with rows of. pins l2 and I3 in'one side and a pin14in the L opposite side, and the pinsare positioned to coact withcorresponding pins in the casing."

The cylinder lOfis formed with a flange l5 at theouter end and a lockbolt It extends from'the inner end which extends through a washer I!that is held by screws l8-and l9. Thejscrews l8 and I9 extend throughthe washer ll and into the casing II, there being a circular opening 9'arranged in the washer I! through which the shaft l6 rotatably projects.The, cylinder is provided with anarcuateor crescent-shaped key slothaving arms 2| and 22 and a groove 23' for a'rib at' the back of a key24. The cylinder is provided with two rows of staggered pin openingsv25'and 26 which are in line with the edges of the arms of the key slot,and another pin opening 21 is propins terminate at the surface of thecylinder when the proper key is inserted in the key slot,

whereas with any other key in the slot the pins will cross theintersection of the cylinder withv the casing and prevent the cylinderturning.

The pins l2 and I 3 coact with pins 30 in the casing and the pin I4coacts with a pin 3| that is,

The

held inward by a spring 32 in a. slot 33. spring 32 is mounted in thecasing by a screw 34,

as shown. The pins 30 are held in the casing by a plate 35 with springs36 urging the pins inward, as shown in Figure 4, and the plate 35 isheld by screws 31 and 38.

The casing II is provided with a facing flange 42 having a circularrecess 43 therein to receive the flange I5 of the cylinder, and threadedlugs 44 and 45 at the sides, by which it may be se cured in a door orthe like. The casing may, however, be provided with any suitablemounting means and the cylinder or pins may be held therein in anysuitable manner.

The pins of the different rows and also the openings therefor in thecasing and cylinder are illustrated as being round or of a cylindricalshape and it will be understood that the pins may be of any suitableshape in cross section and may be provided with means for preventingrotation of the pins in the openings.

The inner ends of the pins are illustrated as being arcuate and thecoacting ends between the sections of the pins in the cylinder and thesections of the pins in the casing are also arcuate to correspond withthe peripheral surface of the lock cylinder I0, as shown in Figure 2,and it will be understood that with the rows of pins positioned offcenter it is essential that the abutting or coacting ends of the pins beshaped to correspond with the line between the cylinder and casing. Theinner ends of the pins are shown as being arcuate and with arcuate endsof the pins positioned on the meeting lines between the cylinder andeasing the cylinder may be rotated or withdrawn.

The pins may be provided with flat sides or grooves may be providedtherein with pins extended inwardly through the cylinder and casing toengage the grooves to prevent rotation of the pins of the look.

A key 24 adapted to be used with the lock is illustrated in Figure 7wherein a cylindrical barrel formed with arcuate sides and 52 extendsfrom a flange 53 with a shank 54 extending from the opposite side of theflange. One side-of the barrel is provided with a rib 55 adapted toregister with the groove 23 of the cylinder '10 and the other side isprovided with a slot 56 with the edges 51 and 58 of the sides 5| and 52on opposite sides of the slot formed with hills and valleys positionedto register with the pins of'the cylinder. The rib 55 is also providedwith an indentation 59 that is positioned to receive the pin l4 of thecylinder. The'barrel of the key and key slot of the cylinder may beprovided with registering ribs and grooves as are generally used inlocks of this type.

With the parts arranged in this manner the proper key may be inserted inthe key slot of the cylinder I 0 and with the key holding the pins .inthe proper positions with the ends of the pins of the cylinder at thesurface thereof the cylinder may be'turned to open or close the look.

It will be understood that other modifications may be made in the designor arrangement of the parts without departing from the spirit of theinvention.

What is claimed is:

In a cylinder lock, the combination which comprises a key actuatedcylinder having a crescent shape key slot therein with the edges of thesaid slot extended inwardly toward a plane through the center of thesaid cylinder providing a substantially cylindrical core in the said keyslot, said core having grooves in the sides, said cylinder having spacedrows of pin receiving openings extended from the said edges of the keyslot to the surface of the cylinder, said pin receiving openings beingpositioned in parallel planes and with the openings of one row staggeredin relation to the openings of the other row, said cylinder also havinga longitudinally disposed groove'in the side of the key slot opposite tothat in which the edges of the slot are positioned, and also having apin receiving opening extended from the said groove to the outer surfaceof the cylinder, a lock bolt extended from theend of the cylinderopposite to that in which the key slot is positioned, a lock casinghaving a bore positioned to receive the said key actuated cylinder andhaving pin receiving openings therein positioned to register with thepin receiving openings of the cylinder, pins positioned in the said pinreceiving openings of the casing and of the cylinder, and springs in thecasing for urging the said pins in the openings in the casing inwardlyand into the respective openings in the cylinder.

VICENTE SANTO DOMINGO BERNARDO.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

